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<b>dn42 wiki / GRE on FreeBSD</b>

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            <h1 id="gre-on-freebsd">GRE on FreeBSD</h1>

<p>This page describes how to configure GRE tunnels on FreeBSD.</p>

<h2 id="requirements">Requirements</h2>

<ul>
  <li>Root access to a FreeBSD system.</li>
  <li>Loaded if_gre.ko or device gre</li>
  <li>A static IPv4 address on both ends if you would like to preserve your sanity.</li>
</ul>

<h2 id="create-a-temporary-gre-tunnel">Create a temporary gre tunnel</h2>

<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ifconfig gre<span class="nv">$INDEX</span> create
ifconfig gre<span class="nv">$INDEX</span> tunnel <span class="nv">$TUNNEL_SRC</span> <span class="nv">$TUNNEL_DST</span>
ifconfig gre<span class="nv">$INDEX</span> inet <span class="nv">$LOCAL</span> <span class="nv">$REMOTE</span> netmask 0xffffffff
ifconfig gre<span class="nv">$INDEX</span> descr <span class="nv">$DESCR</span>
</code></pre></div></div>

<h2 id="create-a-persistent-gre-tunnel">Create a persistent gre tunnel</h2>

<p>Add this to your <code class="language-plaintext highlighter-rouge">rc.conf</code>.</p>

<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">cloned_interfaces</span>=<span class="s2">"$cloned_interfaces gre0"</span>
<span class="n">ifconfig_gre0</span>=<span class="s2">"10.0.0.1 10.0.0.2 netmask 0xffffffff tunnel 1.2.3.4 5.6.7.8 descr foo"</span>
</code></pre></div></div>


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